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Apparent Activation Energy in High Frequency Microwave Sintering of Alumina Ceramic

机译:氧化铝陶瓷高频微波烧结中明显激活能量

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The observed enhancements in the high frequency microwave processing alumina compared to those in conventional method at the same sintering temperatures have been studied. Some possible mechanisms responsible for the enhancements were investigated and are discussed in this paper. The enhancements could be associated with the increase either in driving force or in apparent activation energy of diffusion. An experiment to estimate the driving force of sintering is not easy to perform because the force depends not only on the density and grain size but also on the electric field in the materials. Therefore, a series of experiments to estimate the apparent activation energy were performed in high frequencies microwaves and in conventional sintering method, as well. It was found that the apparent activation energy in conventional sintering was much lower than that of microwave sintering. These activation energy values suggested that diffusion rate in microwaves sintering was faster, which led to the higher densification.
机译:研究了与在相同烧结温度下的常规方法中的高频微波处理氧化铝中的观察到的增强。研究了负责增强的一些可能的机制,并在本文中讨论。增强功能可以与驱动力或在显而易见的扩散能量的增加相关联。估计烧结驱动力的实验不容易执行,因为力不仅取决于密度和晶粒尺寸而且还取决于材料中的电场。因此,在高频微波和常规烧结方法中进行了一系列估计表观活化能量的实验。发现常规烧结中明显的活化能量远低于微波烧结的能量。这些激活能量值表明,微波炉烧结中的扩散速率更快,这导致了更高的致密化。

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